Trimming mechanism for sewing-machines.



J. BERGER. JR.

TRIMMING MECHANISM FOR SEWING MACHINES. APPLICATION FILED 05c. 16. 1912.

1 209,541 Patented Dec. 19, 1916.

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JOSEPH BERGER, an, or U'IICA, mew YonK, Ass1GivonroUmoN srsotnn-lvracnmn COMPANY, or criicaeogrm nois, a conronariolv or ILLnvoIs.

a description, reference beinghad to the acconipanying drawing and to thefigures of reference marked thereon.

My invention relates to'an IIIIPI'OVBIDGDJD in trimming devices, and particularly to a trimming device for sewing machines;

The-particular style of trimming mechanism for which the present invention has been designed, is that known as the Dewees trimmer, manufactured by the Union Spe- V cial Machine Company, and illustrated in Patents Nos. 266,783, October 31st, 1882; 309,699, December 23rd, 1884:, to J. W. Dewees; and 976,023, November 15th, 1910,

to R. G. Woodward, in which upperand lower toggles or knives rock one upon the other and sever the fabric by abrasion, as distinguished from a knife or shear out.

It has been found in practice, especially in trimming of heavy work, that the surfaces of the upper toggles become chipped or grooved, evidently due to the fact that the passage of heavy work through the toggles forces the upper toggle away from the lower one, and when the upward strain is released by the passage of the work from between the toggles, they come together with a blow, thus damaging the thinner face of the upper toggle.

The object of the invention is to overcome this difficulty, and it consists in a generic sense, in providing in rear of the severing edge, a striking plate which will take up th force of the blow, and prevent impact of the thin face of the upper toggle with the broad face of the lower toggle.

The'invention is illustrated in the accompanying drawings, in which- Figure 1 is a front view illustrating the two toggles or knives; Fig. 2 1s a slmilar view, illustrating a different formpf my 1nvention; Fig. 3 is a bottom plan new of the upper toggle shown in Fig. 1; and Fig. 4 is a bottom plan view of the upper toggle shown in Fig. 2.

In these drawings, 1 represents the upper toggle, knife or jaw of my lmproved tr mming device, and 2 the lower cooperatlng Specificationof Letters Patent.

Beit known that l, JOSEPH BERGER, J r

Tami/Line MECHANiSIVI roa sn'wr'iveiivraonmns.

Patented Dec. 19, 1916.

3 Application filed December 16, 1912. Serial No. 737,045.

member upon which the upper member works, and between which and said upper member, the fabric to be operated upon,

passes and is severed.

As the mode of operation and attachment of thejaw toggles or knives is well known in the art, it is not deemed necessary to illustrate any more than the devices themselves. The upper member is provided with an abrading or cutting surface 3, and a heel orspur i, which engages the recess 5 on the lower member 2. The members have a rolling contact with each other, and the fabric between is'severe'cl by abrasion.

In rear of the cutting surface 3, the lower face of the upper member is provided with a widened flattened face 6, which forms a striking plate to contact with the upper face of the lower member, and take up the force of any blow due to sudden impact of the facesof the two members.

As shown in Fig. 2, this striking face 6 is cut away on one side, as at 7, to allow a clearance for the material, and the heel or spur 4 is ground out on one side, as at 8, to allow the piece of fabric previously cut to pass by without striking against the heel or spur.

It will be understood that while I have described the upper toggle as provided with the striking plate and cutting surface, the reverse might be the fact, and I do not wish to be limited to the exact form or dimensions of the striking surface illustrated, so long as a surface is provided which will prevent the thin cutting face from delivering an impact blow upon the cooperating broad face of the other member.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A trimming device for sewing machines including upper and lower cooperating members, said members lying in the same plane, one of said members having a substantially flat co-acting surface, and the other a substantially sharp severing surface, said severing surface terminating at the rear end thereof in a substantially flat surface adapted to take the blow due to sudden iInpact of the two members.

2. A trimming device for sewing ma chines including upper and lower cooperating pivoted members, said pivoted members lying in the same plane and having rolling contact with each other, one of said members having a substantially fiat coacting surface, the other a substantially sharp severing surface, said cutting surface terminating at the rear end thereof in a substantially flat striking surface adapted to take the blow due to sudden impact of the two members.

3. A trimming device for sewing machines including upper and lower cooperating pivoted members, said pivoted mem bers lying in the same plane and having rolling contact with each other, one of said members having a substantially flat coacting surface, the other a substantially sharp severing surface, said cutting surface terminating at the rear end thereof in a substantially flat striking surface adapted to take the blow due to sudden impact of the two members, said member with the severing surface having a cut away portion along the side face thereof adjacent the flat portion to permit the passing of the severed material.

4. A trimming device for sewing machines including an upper and lower pivoted member having rolling contact with each other, one of said members having a recess and the other member having a heel adapted to engage said recess whereby the motion of one member may be imparted to the other, one of said members also having a severing surface adapted to cooperate with a substantially smooth surface on the other member, said severing surface terminating in a substantially flat surface which is cut away at one side to permit one edge of the material to pass the same, said heel having a groove formed therein for the edge of the material.

5. A trimming device for sewing machines including an upper and lower pivoted member having rolling contact with each other, said lower member having a substantially flat cooperating surface, and said upper member having a substantially sharp cutting surface extending from the front end thereof to the point where said upper member contacts with the lower member when said cutting members are moved to the extreme forward position for receiving the material, said cutting surface terminating in a substantially fiat portion.

In testimony whereof,I aiiix my signature in the presence of two witnesses.

JOSEPH BERGER, JR.

Witnesses:

JOHN MILLER, CHAS. B. MASON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Fatents, Washington, D. C." 

